1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
6 #define V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
7 
8 #include <functional>
9 #include <map>
10 #include <queue>
11 #include <vector>
12 
13 #include "include/v8-platform.h"
14 #include "src/base/macros.h"
15 #include "src/base/platform/mutex.h"
16 #include "src/libplatform/task-queue.h"
17 
18 namespace v8 {
19 namespace platform {
20 
21 class TaskQueue;
22 class Thread;
23 class WorkerThread;
24 
25 class DefaultPlatform : public Platform {
26  public:
27   DefaultPlatform();
28   virtual ~DefaultPlatform();
29 
30   void SetThreadPoolSize(int thread_pool_size);
31 
32   void EnsureInitialized();
33 
34   bool PumpMessageLoop(v8::Isolate* isolate);
35 
36   // v8::Platform implementation.
37   void CallOnBackgroundThread(Task* task,
38                               ExpectedRuntime expected_runtime) override;
39   void CallOnForegroundThread(v8::Isolate* isolate, Task* task) override;
40   void CallDelayedOnForegroundThread(Isolate* isolate, Task* task,
41                                      double delay_in_seconds) override;
42   void CallIdleOnForegroundThread(Isolate* isolate, IdleTask* task) override;
43   bool IdleTasksEnabled(Isolate* isolate) override;
44   double MonotonicallyIncreasingTime() override;
45   const uint8_t* GetCategoryGroupEnabled(const char* name) override;
46   const char* GetCategoryGroupName(
47       const uint8_t* category_enabled_flag) override;
48   uint64_t AddTraceEvent(char phase, const uint8_t* category_enabled_flag,
49                          const char* name, uint64_t id, uint64_t bind_id,
50                          int32_t num_args, const char** arg_names,
51                          const uint8_t* arg_types, const uint64_t* arg_values,
52                          unsigned int flags) override;
53   void UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
54                                 const char* name, uint64_t handle) override;
55 
56 
57  private:
58   static const int kMaxThreadPoolSize;
59 
60   Task* PopTaskInMainThreadQueue(v8::Isolate* isolate);
61   Task* PopTaskInMainThreadDelayedQueue(v8::Isolate* isolate);
62 
63   base::Mutex lock_;
64   bool initialized_;
65   int thread_pool_size_;
66   std::vector<WorkerThread*> thread_pool_;
67   TaskQueue queue_;
68   std::map<v8::Isolate*, std::queue<Task*> > main_thread_queue_;
69 
70   typedef std::pair<double, Task*> DelayedEntry;
71   std::map<v8::Isolate*,
72            std::priority_queue<DelayedEntry, std::vector<DelayedEntry>,
73                                std::greater<DelayedEntry> > >
74       main_thread_delayed_queue_;
75 
76   DISALLOW_COPY_AND_ASSIGN(DefaultPlatform);
77 };
78 
79 
80 }  // namespace platform
81 }  // namespace v8
82 
83 
84 #endif  // V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
85